fs/nfs/sysctl.c

   1 /*
   2  * linux/fs/nfs/sysctl.c
   3  *
   4  * Sysctl interface to NFS parameters
   5  */
   6 #include <linux/types.h>
   7 #include <linux/linkage.h>
   8 #include <linux/ctype.h>
   9 #include <linux/fs.h>
  10 #include <linux/sysctl.h>
  11 #include <linux/module.h>
  12 #include <linux/nfs4.h>
  13 #include <linux/nfs_idmap.h>
  14 #include <linux/nfs_fs.h>
  15
  16 #include "callback.h"
  17
  18 #ifdef CONFIG_NFS_V4
  19 static const int nfs_set_port_min = 0;
  20 static const int nfs_set_port_max = 65535;
  21 #endif
  22 static struct ctl_table_header *nfs_callback_sysctl_table;
  23
  24 static ctl_table nfs_cb_sysctls[] = {
  25 #ifdef CONFIG_NFS_V4
  26         {
  27                 .procname = "nfs_callback_tcpport",
  28                 .data = &nfs_callback_set_tcpport,
  29                 .maxlen = sizeof(int),
  30                 .mode = 0644,
  31                 .proc_handler = proc_dointvec_minmax,
  32                 .extra1 = (int *)&nfs_set_port_min,
  33                 .extra2 = (int *)&nfs_set_port_max,
  34         },
  35         {
  36                 .procname = "idmap_cache_timeout",
  37                 .data = &nfs_idmap_cache_timeout,
  38                 .maxlen = sizeof(int),
  39                 .mode = 0644,
  40                 .proc_handler = proc_dointvec_jiffies,
  41         },
  42 #endif
  43         {
  44                 .procname       = "nfs_mountpoint_timeout",
  45                 .data           = &nfs_mountpoint_expiry_timeout,
  46                 .maxlen         = sizeof(nfs_mountpoint_expiry_timeout),
  47                 .mode           = 0644,
  48                 .proc_handler   = proc_dointvec_jiffies,
  49         },
  50         {
  51                 .procname       = "nfs_congestion_kb",
  52                 .data           = &nfs_congestion_kb,
  53                 .maxlen         = sizeof(nfs_congestion_kb),
  54                 .mode           = 0644,
  55                 .proc_handler   = proc_dointvec,
  56         },
  57         { }
  58 };
  59
  60 static ctl_table nfs_cb_sysctl_dir[] = {
  61         {
  62                 .procname = "nfs",
  63                 .mode = 0555,
  64                 .child = nfs_cb_sysctls,
  65         },
  66         { }
  67 };
  68
  69 static ctl_table nfs_cb_sysctl_root[] = {
  70         {
  71                 .procname = "fs",
  72                 .mode = 0555,
  73                 .child = nfs_cb_sysctl_dir,
  74         },
  75         { }
  76 };
  77
  78 int nfs_register_sysctl(void)
  79 {
  80         nfs_callback_sysctl_table = register_sysctl_table(nfs_cb_sysctl_root);
  81         if (nfs_callback_sysctl_table == NULL)
  82                 return -ENOMEM;
  83         return 0;
  84 }
  85
  86 void nfs_unregister_sysctl(void)
  87 {
  88         unregister_sysctl_table(nfs_callback_sysctl_table);
  89         nfs_callback_sysctl_table = NULL;
  90 }